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Electrical cable having a surface with reduced coefficient of friction

a technology of electric cables and coefficients, which is applied in the direction of cables, insulated conductors, conductors, etc., can solve the problems of large alteration of manufacturing lines, high coefficients of external friction, and inability to control the thickness of the sheath properly, so as to reduce the coefficient of friction

Active Publication Date: 2008-08-12
SOUTHWIRE CO LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0020]A cable with low coefficient of friction is achieved thereby, so that subsequent installation of the same is considerably simplified, since it slides over the surfaces with which it comes into contact.

Problems solved by technology

Such cables present the disadvantage that their exterior surface has a high coefficient of friction, so that they are awkward to fit in internal sections of walls and ceilings or conduits, since when they come into contact with the surfaces they become stuck or difficult to pull, etc.
That gives rise to a major alteration of the manufacturing line.
In addition, the equipment for depositing the lubricant must be very close to the sheath extrusion head since otherwise it is not possible to control the thickness of the sheath properly.
In any event, the additional equipment occupies non-negligible space and such an arrangement is not favorable for control over the dimensions of the sheath.
Whatever the prior art method used, the manufacture and / or installation of said cables involves a considerable loss of time and an economic cost, since alternative materials are required.

Method used

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  • Electrical cable having a surface with reduced coefficient of friction
  • Electrical cable having a surface with reduced coefficient of friction
  • Electrical cable having a surface with reduced coefficient of friction

Examples

Experimental program
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Effect test

example

[0048]To understand the effects of the jacket lubricant system on the ease of pull, variations of the UL (Underwriters Laboratories, Inc.) joist pull test were utilized.

[0049]The joist pull test outlined in UL719 Section 23 establishes the integrity of the outer PVC jacket of Type NM-B constructions when subjected to pulling through angled holes drilled through wood blocks.

[0050]The first variation of the test apparatus (see FIG. 2) consists of an arrangement of 2″×4″ wood blocks having holes drilled at 15° drilled through the broad face. Four of these blocks are then secured into an frame so that the centerlines of the holes are offset 10″ to create tension in the specimen through the blocks. A coil of NM-B is placed into a cold-box and is conditioned at −20° C. for 24 hours. A section of the cable is fed through corresponding holes in the blocks where the end protruding out of the last block is pulled through at 45° to the horizontal. The cable is then cut off and two other specim...

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Abstract

The present invention includes a cable having reduced surface friction and the method of manufacture thereof having steps in which a conductor wire is coated with a mixture of a plastic material and lubricating material and in which the coated conductor wire is cooled. The cable includes at least one conductor core and at least one coating of plastic material and incorporates a lubricating material in and / or on the plastic material. The equipment for the manufacturing of electrical cable includes a reel for supplying a conductor wire to an extruding head, which is connected to tanks containing plastic material and lubricating material for coating the conducting wire, and a reel for taking up the cable.

Description

BACKGROUND OF THE INVENTION[0001]Electrical cables which include at least one conductor core and at least one coating are well known.[0002]Such cables present the disadvantage that their exterior surface has a high coefficient of friction, so that they are awkward to fit in internal sections of walls and ceilings or conduits, since when they come into contact with the surfaces they become stuck or difficult to pull, etc.[0003]In order to overcome said difficulty, alternative materials such as vaselines and the like have been used to coat the exterior surface of the cable, thereby reducing the coefficient of friction.[0004]In a complementary manner, guides of small diameter are sometimes used, one end of which is inserted through the cavity through which the cable has to pass and the other is attached to the end of the cable which must be inserted into the cavity. Thus, once the guide has emerged at the desired place it is pulled until the end of the cable appears again after having ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01B7/00
CPCB29C47/0016B29C47/025H01B13/145H01B3/22H01B3/465B29C47/28B29C48/05B29C48/06B29C48/154B29C48/34
Inventor KUMMER, RANDY D.REECE, DAVIDDIXON, MARK D.CARLSON, JOHN R.LAM, HAISASSE, PHILIP
Owner SOUTHWIRE CO LLC
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